=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-05-21
10b5-1 Pre-arranged Plan: Yes
--- Issuer ---
Name: Fortinet, Inc. (FTNT)
CIK: 0001262039
--- Reporting Owner ---
Name: Whittle John
CIK: 0001476336
Role: Officer (CHIEF OPERATING OFFICER)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock
Date: 2026-05-21 | Code: M (Exercise of derivative)
Shares: +89,000 | Price: $34.39
Total Value: $3,060,354.00
Shares Owned After: 183,724 | Ownership: D (Direct)
[Transaction #2]
Security: Common Stock
Date: 2026-05-21 | Code: M (Exercise of derivative)
Shares: +57,015 | Price: $22.90
Total Value: $1,305,415.44
Shares Owned After: 240,739 | Ownership: D (Direct)
[Transaction #3]
Security: Common Stock
Date: 2026-05-21 | Code: S (Open market sale)
Shares: -86,820 | Price: $128.15
Total Value: $11,125,609.67
Shares Owned After: 153,919 | Ownership: D (Direct)
Footnotes:
[F1] The sales reported in this line item were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 19, 2026.
[F2] Represents the weighted average sale price. The lowest price at which shares were sold was $127.48 and the highest price at which shares were sold was $128.47. The Reporting Person undertakes to provide upon request to the staff of the Securities and Exchange Commission, the Issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the range set forth herein.
[Transaction #4]
Security: Common Stock
Date: 2026-05-21 | Code: S (Open market sale)
Shares: -54,979 | Price: $128.74
Total Value: $7,078,166.89
Shares Owned After: 98,940 | Ownership: D (Direct)
Footnotes:
[F1] The sales reported in this line item were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 19, 2026.
[F3] Represents the weighted average sale price. The lowest price at which shares were sold was $128.48 and the highest price at which shares were sold was $129.46. The Reporting Person undertakes to provide upon request to the staff of the Securities and Exchange Commission, the Issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the range set forth herein.
[Transaction #5]
Security: Common Stock
Date: 2026-05-21 | Code: S (Open market sale)
Shares: -4,216 | Price: $129.55
Total Value: $546,171.84
Shares Owned After: 94,724 | Ownership: D (Direct)
Footnotes:
[F1] The sales reported in this line item were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 19, 2026.
[F4] Represents the weighted average sale price. The lowest price at which shares were sold was $129.48 and the highest price at which shares were sold was $129.71. The Reporting Person undertakes to provide upon request to the staff of the Securities and Exchange Commission, the Issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the range set forth herein.
--- Derivative Transactions ---
[Transaction #1]
Security: Stock Option (right to buy)
Date: 2026-05-21 | Code: M (Exercise of derivative)
Shares: -89,000 | Price: $0.00
Exercisable: N/A | Expires: 2028-02-19
Shares Owned After: 0 | Ownership: D (Direct)
Footnotes:
[F5] The options are fully vested.
[Transaction #2]
Security: Stock Option (right to buy)
Date: 2026-05-21 | Code: M (Exercise of derivative)
Shares: -57,015 | Price: $0.00
Exercisable: N/A | Expires: 2027-02-21
Shares Owned After: 0 | Ownership: D (Direct)
Footnotes:
[F5] The options are fully vested.
--- Footnotes (Complete Index) ---
F1: The sales reported in this line item were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 19, 2026.
F2: Represents the weighted average sale price. The lowest price at which shares were sold was $127.48 and the highest price at which shares were sold was $128.47. The Reporting Person undertakes to provide upon request to the staff of the Securities and Exchange Commission, the Issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the range set forth herein.
F3: Represents the weighted average sale price. The lowest price at which shares were sold was $128.48 and the highest price at which shares were sold was $129.46. The Reporting Person undertakes to provide upon request to the staff of the Securities and Exchange Commission, the Issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the range set forth herein.
F4: Represents the weighted average sale price. The lowest price at which shares were sold was $129.48 and the highest price at which shares were sold was $129.71. The Reporting Person undertakes to provide upon request to the staff of the Securities and Exchange Commission, the Issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the range set forth herein.
F5: The options are fully vested.
--- Signature ---
/s/ /s/ Robert Turner, by power of attorney (2026-05-22)
